There are no problems with the ABS in fact the brakes are so good that the ABS is not used unless you grab too hard etc.If the owner has had the frame checked he should have a ticket showing it - if not then, as suggested, do a Vin check.Just remember when you do ride it the feel is different and this sometimes puts people off, don't worry you soon become accustomed to it as it is a much better handler than others.